/*
 +-----------------------------------------------------------------------------------------------+
 | Project : UKAPI
 +-----------------------------------------------------------------------------------------------+
 | Project Description : Universal & Kernel API
 +-----------------------------------------------------------------------------------------------+
 | File Description :
 |   Error Check
 |                                                 
 +-----------------------------------------------------------------------------------------------+
 | Licence : MIT Licence
 +-----------------------------------------------------------------------------------------------+
 | Copyright (c) 2006 Olivier Vanhoucke
 | 
 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 | and associated documentation files (the "Software"), to deal in the Software without 
 | restriction, including without limitation the rights to use, copy, modify, merge, publish, 
 | distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the 
 | Software is furnished to do so, subject to the following conditions:
 | 
 | The above copyright notice and this permission notice shall be included in all copies or 
 | substantial portions of the Software.
 | 
 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 | BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 | DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 +-----------------------------------------------------------------------------------------------+
*/

/**
 * Inclusions standards
 */
#include <ukapi.h>

extern dword_t internal_crc32_table[256];
extern void errorcheck_internal_init_crc32();

dword_t errorcheck_get_crc32( pbyte_t byte, size_t size )
{
	dword_t	crc = 0xffffffff;	/* preload shift register, per CRC-32 spec */
    pbyte_t p;

    if ( !internal_crc32_table[1] )		/* if not already done, */
	{
		errorcheck_internal_init_crc32();		/* build table */
	}

    for ( p = byte; size > 0; ++p, --size )
	{
            crc = ( crc << 8 ) ^ internal_crc32_table[ ( crc >> 24 ) ^ *p ];
	}

    return ~crc;						/* transmit complement, per CRC-32 spec */
}
